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151 lines
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..
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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====================================================================
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Support backup import on another Storage database
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====================================================================
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URL of launchpad blueprint:
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https://blueprints.launchpad.net/cinder/+spec/support-backup-import-on-another-storage-database
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* This backup service can use a backup extra metadata in order
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to import a backup on a different Block Storage.
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Problem description
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===================
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* Currently a volume backup can only be restored on the same Block Storage
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service.
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This is because restoring a volume from a backup requires metadata available
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on the database used by the Block Storage service.
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* In order to import backup metadata on another Block Storage database
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(i.e disaster recovery site), one has to save the metadata of a volume
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backup available on the source database, and then replicate it together
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with the data to the other Block Storage site.
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* Combination of the local backup service that exports and stores
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this metadata, together with replication to another Block Storage site,
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allows you to completely restore the backup even in the event of
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a catastrophic database failure.
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* In addition, having a backup metadata together with a volume backup,
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also provides volume portability.
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Specifically, backing up a volume and exporting its metadata will allow you
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to restore the volume on a completely different Block Storage database,
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or even on a different cloud service.
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Use Cases
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=========
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* When a user wants to save backup metadata together with volume backup for
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volume portability purpose, or for replication purpose to disaster
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recovery site, and be able to restore a volume from a backup on the other
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Block Storage site.
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Proposed change
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===============
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* In order to support backup import on a different Block Storage database,
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we need to extend chunked backup driver:
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* Enabling to save backup metadata together with the data.
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* Add a cinder client api command, that will parse backup metadata from
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backup_metadata file, and import that metadata to the other
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Block Storage database.
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* User will be able to restore a volume backup on the other
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Block Storage, using cinder backup restore api.
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Alternatives
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------------
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Support only storage on local storage.
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Use slow manual backup and restore methods.
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Data model impact
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-----------------
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None.
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REST API impact
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---------------
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None.
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Security impact
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---------------
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None.
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Notifications impact
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--------------------
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None.
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Other end user impact
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---------------------
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None.
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Performance Impact
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------------------
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None.
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Other deployer impact
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---------------------
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None.
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Developer impact
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----------------
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None.
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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ronen-mesonzhnik
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Other contributors:
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None
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Work Items
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----------
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- Implement get_extra_metadata that will return backup's corresponding
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database information as encoded string metadata.
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- Implement a cinder client api command that can take a backup metadata
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file, and do the import from it.
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Dependencies
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============
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None.
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Testing
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=======
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None.
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Documentation Impact
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====================
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* In addition to the existing command 'cinder backup-import <METADATA>',
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there will be a command that can accept a file:
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'backup-import-record-from-backup-metadata-file <file_path>'
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References
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==========
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* Link to Export and import backup metadata documentation:
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http://docs.openstack.org/admin-guide-cloud/blockstorage_volume_backups_export_import.html
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